python挖矿算力测试程序详解

import hashlibx = 11y = 1#这里可以调节挖矿难度，也就是哈希的长度while hashlib.sha256(f'{x*y}'.encode("utf-8")).hexdigest()[5:7]!="00":  print(x*y)  y +=1print("找到了：",(x*y))

#挖矿原理与网络共识import datetimeimport hashlibimport jsonimport requestsclass Blockchain2:  def __init__(self):    self.chain = [] #区块链列表    self.nodes = set() #节点集合    self.current_tranactions = [] #交易列表    self.new_block(proof=100,preHash=1) #创建第一个区块  #新建一个区块，需要计算，才能追加  def new_block(self,proof,preHash = None):    block={      "index":len(self.chain)+1,#区块索引      "timestamp":datetime.datetiem.now(),#区块时间戳      "transactions":self.current_tranactions,#区块交易记录集合      "proof":proof,#算力凭证      "preHash":preHash or self.hash(self.chain[-1]), #上一块的哈希    }    self.current_tranactions = [] #开辟新的区块，初始化区块交易记录    self.chain.append(block)  @staticmethod  def hash(block):    #处理为json字符串格式的哈希    block_str = json.dumps(block,sort_keys=True).encode("utf-8")    return hashlib.sha256(block_str).hexdigest()  #新增交易记录  def new_transaction(self,sender,receiver,amount):    transaction ={      "sender":sender,      "receiver":receiver,      "amount":amount,    }    self.current_tranactions.append(transaction)    return self.last_block["index"]+1  @property  def last_block(self):    return self.chain[-1]  #挖矿，依赖上一个模块，获取工作量证明，即POW共识机制  def proof_of_work(self,last_block):    last_proof = last_block["proof"]    last_hash = self.hash(last_block)    proof = 0    while self.valid_proof(last_proof,proof,last_hash) is False:      proof +=1    return proof  #校验工作量  @staticmethod  def valid_proof(last_proof,proof,last_hash):    guess = f'{last_proof}{proof}{last_hash}'.encode("utf-8")    guess_hash = hashlib.sha256(guess).hexdigest()    return guess_hash[:6] =="000000" #可以调整计算难度  #区块一致性，同步算法,  def resolve_conflicts(self):    neighbours = self.nodes    new_chain = None    max_length = len(self.chain)    #遍历所有节点，找出最长的链    for node in neighbours:      #获取节点区块链信息      response = requests.get(f'http://{node}/chain')      if response.status_code ==200:        length = response.json()["length"]        chain = response.json()["chain"]        if length>max_length and self.valid_chain(chain):          max_length = length          new_chain = chain    if new_chain:      self.chain = new_chain      return True    else:      return False  #校验区块链的合法性  def valid_chain(self,chain):    last_block = chain[0]    current_index = 1    #校验每一个区块的prehash,proof合法性    while current_index <len(chain):      block = chain[current_index]      #校验哈希的合法性      if block["preHash"] != self.hash(last_block):        return False      #校验算力的合法性      if not self.valid_proof(last_block["proof"],block["proof"],block["preHash"]):        return False      last_block = block      current_index +=1    return True